 
     [:div.audio-player {:class (clj->js (:status @state))}
      [:div.play-button
-      {:on-click toggle-play}]
+      {:class (when (is-playing) "is-playing")
+       :on-click toggle-play}]
 
      [:div.seek-bar
       {:on-click seek-time


           (go-loop []
             (match [(<! ch)]
                    [:play]        (do (.play audio) (recur))
                    [:pause]       (do (.pause audio) (recur))
                    [[:seek time]] (do (set! (.-currentTime audio) time) (recur))
                    :else nil))))

             [(events/listen audio "durationchange" update-time)
              (events/listen audio "timeupdate" update-time)
              (events/listen audio "progress" update-progress)
              (events/listen audio "play" #(update-status :play))
              (events/listen audio "playing" #(update-status :playing))
              (events/listen audio "pause" #(update-status :paused))
              (events/listen audio "ended" #(update-status :ended))
